Lightroom 2015 curves bug

Merged

I can't click and drag a curve point without it sticking as I drag. It's like the point hits an invisible wall especially as I drag to the right. Dragging the line as a whole from either corner of the panel is totally impossible. The point sticks and then all of a sudden it will jump half way up the panel.

I started experiencing this issue after the 2015.6 update. I've been on the phone with Adobe numerous times about this. They kept promising to escalate the issue to engineering and a call back to no avail. Finally, 2 days ago I spoke to a senior person who told me they were able to reproduce the issue in different environments and have reported the bug. Hopefully we'll see a fix soon.

This "bug" is actually an as-designed Lightroom behavior. When the active curve point is moved too far beyond the allowed minimum or maximum end points along the x-axis (input value), Lightroom would snap and reset to a point curve with the dragged curve point removed. It is kind of a shortcut to allow one to discard the current point curve change (by quickly moving the mouse beyond the allowed range).

I agree this behavior is kind of unexpected from the customer point of view. Especially when dragging one of the two extreme end-points along the x-axis ([0,0],[255,255]), people tends to overshoot and intentionally drag the mouse to the left or to the right as much possible. Unfortunately, that would trigger this erractic behavior more often. This snap to reset behavior will be removed in the next Lightroom update. One can quickly remove a curve point by hovering over it and do a double click.

No, I realize you can either double click points or drag them off of the curves panel to remove them.That's not unexpected. The problem is that points, even if they're in the center of the panel, "stick" as I move my mouse slowly across the desk. Yesterday I slowly moved my mouse to the right halfway across my desk as the point I was trying to drag sat motionless.

I'm a longtime Photoshop and Lightroom user and I know since the latest Lightroom release that the panel isn't functioning as it should. The curves panel in PS still works perfectly.

The shift trick will get me through till the next update though.Thanks for responding!

Hi. I reported something similar, and Simon nicely pointed me to this conversation.The shift key doesn't help me because I am trying to set the white and black levels, so I need to move the top-right and bottom-left points to the left and right, not up and down.I was hoping that the alt/option key would help, but while it makes the response slower, it doesn't change the fundamental problem.Zac, if you try your test again of moving your mouse halfway across your desktop, you will (I think) notice that when you let go of your mouse, the cursor is against the edge of your screen. The issue is (in part) that Adobe hides the cursor while you drag, and then when the cursor bumps into the edge of the screen, you have "run out of space to drag." If you make your window smaller or move it to the left, then you will have more room to the right to drag.As I reported in my other posting, there is hysteresis in the algorithm -- the mapping of cursor position to dot-on-the-curve position depends on the history of dragging, so even if you were once able to put the dot where you want it, if you drag around a bit, eventually you will not be able to put the dot where you want it.I just discovered a work-around, at least for my setup. I have two screens. If I move the Lightroom window onto the left screen, then I have oodles of space to the right in which to drag. And as long as I make sure that the Tone Curve panel is near the middle of the screen, I also have enough space above and below to drag.I am not completely sure that Zac's complaint and mine are the same, but they are certainly related, and hopefully the next version of Lightroom will fix both.